progs/collatz.scala
author Christian Urban <urbanc@in.tum.de>
Wed, 10 May 2017 17:03:21 +0100
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def collatz(n: BigInt) : Boolean = {
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  if (n == 1) true else 
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  if (n % 2 == 0) collatz(n / 2) else 
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  collatz(3 * n + 1)
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}